This experiment was conducted during the 1978-79 season to evaluate the productivity of 12 cultivars of Italian ryegrass introduced from Japan and West Germany at Jeju. The results obtained are as follows: 1. Tetrone, Dalita and N.F.G. cultivars (West Germany) grew well during the growing season, while Wase-yataka and Lirasand showed faster growth than other cultivars at the early stage of growth. 2. Tetrone Italian ryegrass gave the highest dry matter yield (1,563㎏/l0a), followed by control cultivar (1,561㎏/l0a) and Wase-yataka (1,545㎏/l0a). 3. Productivity of Wase-yataka and cultivar as control were increased significantly (P$lt;0.01) in the early stage of growth, but Mammoth and Dalita showed remarkable productivity in May. 4. For all cultivars, the highest yield was obtained at the 2nd cut and amounted to 50% or more of the total dry matter yield over the growing period.